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Shoppers line up inside Trader Joe's for the grand opening on 14th Street on March 17, 2006 in New York . (MICHAEL NAGLE/GETTY IMAGES/Getty Images)
Shoppers line up inside Trader Joe's for the grand opening on 14th Street on March 17, 2006 in New York . (MICHAEL NAGLE/GETTY IMAGES/Getty Images)

Value: John Warrillow

Seven ratios to track in your business Add to ...

Doctors in the developing world measure their progress not by the aggregate number of children who die in childbirth but by the infant mortality rate, a ratio of the number of births to deaths.

Similarly, baseball’s leadoff batters measure their “on-base percentage” – the number of times they get on base as a percentage of the number of times they get the chance to try.

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